Once you learned the tones on the Xterra you sure dont need to use discrimination.
I NEVER use disc on the 705!! I takes away to much good stuff.
And yes you get good numbers on cans and thicker foil. But I check with pinpoint to see how big the target is and how it sounds like.
A tagets that is near or on the surface often gives a double tone. I dig iron but not much. Most of them are big round iron rings.
I have been digging so much shotgun cartridges in the woods, but you gotta dig them even they are
iffy signals. They jump in at the same numbers as the small hammered coins and other relics.
But when you pass over a good target you can hear it. Its often a solid tone, if not standing om edge or are
a deep target.
I use multitone,and as high sens as possible . Always noice cancel and set a good ground balance. Treshold at a buzz, usually 6-7.And I have been using the 5x10 HF coil, wonderful light coil with very good
performance.
Dont always depend on the numbers, I have been digging good targets at -6 but they have been deep.
Of course iron can be cool relics as well. Big or deep iron often goes in at 48, but that can even BIG silver coins/ relics do ,have I
experienced.
Mike the Swede.